Drilling-tool.



No. 836,845 PATENTED NOV. 27, 1906.

' W. O. WHITGOMB.

DRILLING TOOL. APPLICATION FILED NOV.'2. 1905.

lllllllllillllllllll WILLIAM (J. WHITCOMB, OF CHICAGO, ILLINOIS DRILLING-"TOOL.

Specification of Letters Patent.

Patented Nov. 27, 1906.

Application filed November 2, 1906. Serial No. 286.616.

To all whom it may concern:

Be it known that I, WILLIAM C. WHIT- COMB, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Drilli -Tools, of which the followin is a specification, and which are illustrate in the accompanying drawings, forming a part thereof.

a to a head and in certaindetails of construction,

all aswill be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a central longitudinal section of a drillingtool involving theinvention. Fig. 2 is an end.view of the same, partly broken away;

and 3 is a perspective view showing a detallo heconstructionseparatedfromot er parts.

' As is'customary in devices of this kind, the

drilling-tool is shown as comprisin a head 12, having a socket 13, adapted to t snugly upon the tapered end of a drill-plunger. The

head of the drilling-tool is also provided with the usual transverse opening 14 for the insertion of a wedge to be used in removing the tool from the plunger of the machine.

At the forward end of the tool-head 12 there is a chamber or socket 15 and there are employed in connection with the tool-head a p urality of independent cutters or blades 16, (shown as five in number,) each having a cutting ed e 18 and so disposed upon the end of the too -head that its cutting edge is radial to the axis thereof and to that of the plunger 10. Preferably each cutter'or blade 16 is formed with a shoulder 19 for bearing upon the rim of the socket 15, and an arm 20, which reaches into the socket, and a bolt is employed for seeming all of the cutters to the tool-head.

In the particular form of device illustrated in the drawings this bolt is of tapered form for example, the

21 and is adapted to bear upon the inner edge of each of the cutters by a wedging action, so that each of the arms 20 is firmly gripped between the wall of the'socket 15 and the bolt, and to more securely hold the cutter to its seat a circumferential roove or pocket 22 is formed in the wall of t e socket, and upon each of the cutters there 1s provided a foot-piece or lug 23, extendlng lnto this groove. Preferably, also, in this form of the device the outer end of the tool-head 12, includin the wall of the socket 15, takes the form 0 a nut or collar 24, havmg a threaded engagement with the body of the tool-head, as indicated at 25, and the bolt 21 is inserted from the inner end of this collar when the latter is removed and is provided with a flattened head 26, which bears upon the end of the tool-head as the collar 1s turned to its seat to advance the bolt and secure the cutters in place.

As shown, the inner edge of each of the cutters '16 is slightly inclined, Fig. 3, to correspond with the pitch of the bolt 21 and is also formed concave, as indicated at 27, to fit over the bolt.. In using this form of the device the tool-head 12 will be applied to the outer end of a reciprocatory drill-plunger 10 and employed for boring or cutting in the ordinary way. When it is desired to replace any of the cutters 16 bynew ones or to sharpen them, the collar 24 will be unscrewed from its seat, after which the bolt 21 may be driven out and the cutters easily removed from the socket 15.

I claim as my invention 1. In a drilling-tool. combination, a twopart head, the parts of the head having an end-to-end threaded connection and the forward end of the head having a socket coaxial with its body, a plurality of cutters radially disposed upon the end of the head and each having an arm extending into its socket, and a wedging-bolt entering the socket from the inner end of the forward part of the head and bearing outwardly upon the arms of the cutters.

2. In a drilling-tool, in combination, a head having a socketed end and a groove in the wall of the socket, a cutter at the end of the head extending into the socket adjacent a wall thereof and having a foot-piece entering the groove, and a wedging-bolt entering the socket of the head between the cutter and the opposite wall of the socket.

3. In a drilling-tool, in combination, a

head having a socketed end and a circumferential groove in the wall of the socket, a plurality of cutters radially disposed upon the end of the head, each having an arm extending into the socket and a foot-piece entering the groove, and a wedging-bolt bearing on the arms and secured to the head.

4. In a drilling-tool, in combination, av

inner end of the forward part of the head and bearin outwardly upon the arms of the cutters.

5. In a drilling-tool, in combination, a two-part head, the parts of the head having an end-to-end threaded connection and the forward end of the head having a socket corality of cutters each fitting into the socket and entering one of the slots, and a wedgingbolt entering the socket from the ilmer end of the forward part of the head and bearing outwardly on the cutters.

6; In a drilling-tool, in combination, a two-part head, the parts of the head having anend-to-end threaded connection and the forward end of the head having a socket coaxial with its body, a plurality of radiallydisposed slots and a circumferential groove in the Wall of the socket, a lurality of cutters each fitting into the soc et and entering one of the slots and having a foot=piece entering the groove, and a wedging-bolt entering the socket from the inner end of the forward part of the head and bearing outwardly on the cutters.

WILLIAM C. WHITCOMB.

Witnesses:

Lonrs K. GILLSON, CHARLES B. GILLsoN. 

